The Dark Wyvern is the main boss of the Obsidian Mod. When the Mechanical Feather is used, two Dark Wyverns will spawn and attack the player. The Dark Wyvern is 2x times bigger than a normal Wyvern.

Hallowed Armor is recommended for this fight due to the abilities they have. The first ability they have is to throw purple spikey balls at you which deal over 50 damage, Hermes Boots or Spectre Boots are recommended for this. The second ability they have is to spawn Young Harpies that will attack you, it is recommened to switch to the harpies once they spawn otherwise they can cause some serious trouble. Dodge the Dark Wyvern's just how you do with the normal ones as the Dark Wyvern's do 65 base damage with their head, while they do 45 base damage with their body. A Flamethrower is very effective for this fight.